Arrows: This exercise is great! There is not much wrong here. The only thing to look out for is that it looks like you tried to redraw a couple lines, making them look scratchy and messy. If you mess up a line don’t fix it and just leave it as is. But its not very prevalent so nice job.

Sausages: These look good! I notice that it looks like you outlined the circle shapes of your organic forms with a dotted line. Its not a huge deal, but it makes the final result look messier. I would try to avoid this for any sausage forms in the future. The other thing is that the degrees of your ellipses don’t increase as much as they should when they reach the ends of the sausage.

It needs to look more like this: https://d15v304a6xpq4b.cloudfront.net/lesson_images/061ed3b6.jpg

And not like this: https://d15v304a6xpq4b.cloudfront.net/lesson_images/6822fd02.jpg

I also notice that most of the sausages have only 3 ellipses, I would always go for about 5-6 ellipses. That will also help you with changing the degrees.

Texture analysis: On this exercise, it looks to me like you were outlining the forms of the texture with lines instead of drawing the shadow shapes, especially on the sea star exercise. You drew the shapes of the circular bumps instead of drawing the shadows that the circular bumps would have cast. Also, the transition between the black bar and the texture could be smoother and less evident, similar to this:

https://d15v304a6xpq4b.cloudfront.net/lesson_images/7d1f3467.jpg

When you are filling in the shadow shapes, you should also be careful to make it all black and remove any white spots. It can be helpful to buy a brush pen to fill in these large blocks of shadow space, something like this: https://www.amazon.com/Pentel-Brush-Black-Pigment-SESP15BPA/dp/B08NNPKD2D/ref=sr_1_7?crid=C9GX6GTXXR1P&keywords=black+brush+pen+art&qid=1658502996&sprefix=black+brush+pen+art%2Caps%2C280&sr=8-7

Dissections: Very solid work here! I can see that for most of these you correctly drew the shadow shapes instead of drawing lines, so good job. The only problem is that some of the textures do not wrap around the forms of the sausage quite enough. It is important to understand how the textures wrap around the forms because failing to do so will completely flat out the 3dness of the drawing. Here is an example:

https://d15v304a6xpq4b.cloudfront.net/lesson_images/e58b7887.jpg

Its not a problem in every texture but there are a few that have this issue.

Form intersections: Great job, you understood the intersections pretty well especially considering that this is your first time. When you added line weight in some of the shapes, the lines got a bit messy and scratchy. Remember that every line you draw, even line weight lines should be drawn confidently and straightly in one stroke using the ghosting method. The other thing you missed that could be helpful is to draw through the intersections. What I mean by this is, let's say, a cube is intercepted with a plane in its corner. You draw the two sides of the cube that face the camera but forget the back side that is blocked by the ones in the front. It's not a huge deal, but drawing through the form intersections will help you understand how they operate more. I am not going to require it, but you can go back and draw in the back lines that you forgot, if you want.

Organic intersections: These have the same issues with the messy line weight in the form intersection exercise and the shadows that are not fully shaded like in the texture analysis exercise. Fixing the scratchy shadows and having smooth confident line weight will make your drawings a lot cleaner. Drawing line weight using the ghosting method can be a bit difficult, because the line might not adhere perfectly to the line under it which it is supposed to be giving weight to. With practice however, eventually you will be able to draw ghosted lines perfectly over the original line and you won’t need to rely on scratchy line weight.